CFA8 the Chalfonts and Amersham
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HIGH SPEED RAIL (LONDON - WEST MIDLANDS) Supplementary Environmental Statement 3 and Additional Provision 4 Environmental Statement Volume 2 | Community forum area reports CFA8 The Chalfonts and Amersham High Speed Two (HS2) Limited One Canada Square October 2015 London E14 5AB T 020 7944 4908 E [email protected] Z14 SES3 and AP4 ES 3.2.1.8 SES3 and AP4 ES – VOLUME 2 SES3 and AP4 ES – VOLUME 2 www.gov.uk/hs2 HIGH SPEED RAIL (LONDON - WEST MIDLANDS) Supplementary Environmental Statement 3 and Additional Provision 4 Environmental Statement Volume 2 | Community forum area reports CFA8 The Chalfonts and Amersham High Speed Two (HS2) Limited One Canada Square October 2015 London E14 5AB T 020 7944 4908 E [email protected] Z14 SES3 and AP4 ES 3.2.1.8 www.gov.uk/hs2 High Speed Two (HS2) Limited has been tasked by the Department for Transport (DfT) with managing the delivery of a new national high speed rail network. It is a non-departmental public body wholly owned by the DfT. A report prepared for High Speed Two (HS2) Limited: High Speed Two (HS2) Limited, One Canada Square, London E14 5AB Details of how to obtain further copies are available from HS2 Ltd. Telephone: 020 7944 4908 General email enquiries: [email protected] Website: www.gov.uk/hs2 Copyright © High Speed Two (HS2) Limited, 2015, except where otherwise stated. High Speed Two (HS2) Limited has actively considered the needs of blind and partially sighted people in accessing this document. The text will be made available in full via the HS2 website. The text may be freely downloaded and translated by individuals or organisations for conversion into other accessible formats. If you have other needs in this regard please contact High Speed Two (HS2) Limited. Printed in Great Britain on paper containing at least 75% recycled fibre. SES3 and AP4 ES Volume 2 – CFA8, The Chalfonts and Amersham Contents Structure of the HS2 Supplementary Environmental Statement 3 and Additional Provision 4 Environmental Statement 1 Structure of this report 3 1 Introduction 5 Part 1: Supplementary Environmental Statement 3 7 2 Summary of changes 7 2.1 New environmental baseline information 7 2.2 Topics included in the SES3 assessment 8 3 Assessment of changes 9 3.1 Traffic and transport 9 3.2 Water resources and flood risk assessment 12 Part 2: Additional Provision 4 Environmental Statement 15 4 Summary of amendments 15 5 Assessment of amendments 18 5.1 Provision of the monitoring and protection of Shardeloes Park (AP4-008-001) 18 5.2 Extension to the Chiltern tunnel from Mantle's Wood portal to South Heath green tunnel north portal and associated works (AP4-009-001) 18 6 Combined effects of amendments in this CFA due to changes in traffic flows 37 List of figures Figure 1: Locations of amendments in CFA8 17 List of tables Table 1: Scheme definitions 5 Table 2: Summary of corrections in CFA8 8 Table 3: Summary of amendments in CFA8 16 i SES3 and AP4 ES Volume 2 – CFA8, The Chalfonts and Amersham Structure of the HS2 Supplementary Environmental Statement 3 and Additional Provision 4 Environmental Statement The Supplementary Environmental Statement 3 (SES3) and Additional Provision 4 Environmental Statement (AP4 ES) comprises: non-technical summary (NTS). This provides a summary in non-technical language of the SES3 (Part 1) and AP4 ES (Part 2) and of any likely significant environmental effects, both beneficial and adverse, which are new or different to those reported in the High Speed Two (HS2) Phase One Environmental Statement (ES) submitted to Parliament in November 2013 in support of the hybrid Bill (‘the Bill’) for Phase One of HS2 (hereafter referred to as ‘the main ES’) as updated by subsequent SES and AP ES documents; Volume 1: introduction to the SES3 and AP4 ES. This introduces the supplementary environmental information and design changes included within the SES3 and amendments, which have resulted in the need to amend the Bill, within the AP4 ES. It also explains any changes to the scope, methodology, assumptions and limitations required for the environmental assessment; Volume 2: community forum area (CFA) reports and map books. These describe the supplementary environmental information and design changes included within the SES3 (Part 1) and amendments within the AP4 ES (Part 2). Any new or different likely significant environmental effects arising from these changes and amendments in each CFA, compared to those reported in the main ES, as updated by SES and SES2 documents (and SES3 for the AP4 amendments) are reported. The AP1, AP2 and AP3 amendments are also taken into account where relevant. In addition, the main local alternatives that have been considered are described, where relevant; Volume 3: route-wide effects. This reports new or different likely significant route-wide effects arising from the supplementary environmental information and design changes included within the SES3 (Part 1) and amendments within the AP4 ES (Part 2) compared to those reported in the main ES as updated by SES and SES2 (and SES3 for the AP4 amendments). The AP1, AP2 and AP3 amendments are also taken into account where relevant; Volume 4: off-route effects. This reports new or different likely significant off- route effects arising from the supplementary environmental information and design changes included within the SES3 (Part 1) and amendments within the AP4 ES (Part 2) compared to those reported in the main ES as updated by SES 1 and SES2 (and SES3 for the AP4 amendments). The AP1, AP2 and AP3 amendments are also taken into account where relevant; Volume 5: appendices and map books. This contains environmental information and associated maps in support of the other volumes of the SES3 and AP4 ES; and glossary of terms and list of abbreviations. This contains any new or different terms and abbreviations used throughout the SES and AP ES reports, additional to those included in the main ES. 2 Structure of this report This volume of the SES and AP4 ES is divided into CFA reports which are in turn divided into two parts. Part 1 of this CFA report provides supplementary environmental information relating to: new baseline information with respect to traffic and transport and water resources and flood risk assessment; and a correction to the SES or AP2 ES. Part 1 of each CFA report includes, where relevant: a description of the changes or updates within the CFA that have triggered the need for reassessment; an assessment of the environmental effects of the changes for relevant environmental topics considering the: - scope, assumptions and limitations of the SES3 assessment; - changes of relevance to the assessment; - environmental baseline; - effects arising during construction; - effects arising from operation; and - mitigation and residual effects; and a summary of any new or different likely residual significant effects as a result of the changes. Part 2 of this CFA report provides environmental assessment information relating to proposed amendments to the design, which have resulted in the need to alter the powers conferred by the Bill. The following is included where relevant: a summary of the proposed amendments within each CFA that have triggered the need for reassessment; a description of each amendment; an assessment of the environmental effects of each amendment for relevant environmental topics considering the: - scope, assumptions and limitations of the AP4 ES assessment; - environmental baseline; - effects arising during construction; - effects arising from operation; and - mitigation and residual effects; and 3 a summary of any new or different likely residual significant effects as a result of each proposed amendment. 4 1 Introduction 1.1.1 The Bill for high speed rail between London and the West Midlands was submitted to Parliament together with the main ES in November 2013. The AP1 ES, which was submitted in September 2014, contained generally minor amendments to the design of the original scheme (i.e. the scheme submitted in November 2013) in CFAs 7 – 26. The SES and AP2 ES which was submitted in July 2015, updated the main ES and contained a number of further amendments to the design of the original scheme in CFAs 4 – 26. The SES2 and AP3 ES which was submitted in September 2015, contained further updates to the main ES and reported the assessment of a number of amendments to the design of the original scheme in CFAs 1 – 5. 1.1.2 Since the submission of the main ES and subsequent SES and AP documents, updates to environmental baseline information and changes to scheme design or assumptions have occurred, which may lead to new or different significant effects. These effects, depending on the type of change, are reported in the SES3 (Part 1) or AP4 ES (Part 2) of this document, where they occur. 1.1.3 The Bill and associated Additional Provisions (APs) to the Bill described above, if enacted by Parliament, will provide the powers to construct, operate and maintain Phase One of HS2. 1.1.4 In order to differentiate between the original scheme and the subsequent changes, the terms set out in Table 1 are used. Table 1: Scheme definitions Scheme name Definition Relevant CFAs the original scheme the Bill scheme submitted to Parliament in November 2013, which was assessed in 1 – 26 the main ES the AP1 revised scheme the original scheme as amended by the AP submitted in September 2014 7 – 26 the SES scheme the original scheme with the design changes described in the SES submitted in July 4 – 26 2015 the AP2 revised scheme the SES scheme as amended by the AP2 submitted in July 2015 4 – 26 the SES2 scheme the original scheme as updated by the SES scheme, with the design changes 1 – 5 (i.e.